DC POWER SUPPLY SYSTEM AND CONTROL METHOD

摘要

The purpose of the present invention is to provide a DC power supply system and control method, said DC power supply system being capable of continuously charging a storage battery using a constant current, even when a support current is required due to an overload or the like while charging the storage battery, and suppressing current output from the battery as much as possible. When a charger (13) operates at an output voltage potential lower than the output voltage potential of a rectifier (11) while charging a storage battery (103), a power supply system (301) controls the output current from the charger (13) so that a charge current (Ie) from the charger (13) to the storage battery (103) maintains a predetermined value. And when, while charging the storage battery (103), a load (102) demands a larger current than the current supplied by the rectifier (11), the output voltage potential of the rectifier (11) becomes smaller than the output voltage potential of the charger (13) due to current droop, and a diode (12) conducts current, the power supply system (301) controls the output current from the charger (13) so that the charge current (Ie) maintains the predetermined value and so that a support current (Ic) supplied to the load (102) side is output by the charger (13).